Dynamo-electric machine



Ju' e 1926. v J. C. HUTTON DYNAMO ELECTRI C MACHINE Filed May 19. 1925 aMC MWZ;

Patented June 1, 1926.

were star-as JAMES COCHRANE HUT'EON, F

reins.

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BIItIvIINGI-IAIYI, ENGLAND, ASSIGNORJTO TIE-IE BRITISH BRITISH. COMPANY.V

' DYNAMO-ELEGTEIG MAUI-ZINE.

Application filed May 19, 1925, Serial No. 31,319, and-in Great BritainMay 16, 1924.

'- mon drive and thus positioned axially in relation to one another, ithas been necessary to provide a coupling member between the respectivedriving shafts of the magneto and the dynamo and to support each of thedriving shafts in two bearings, thus involving the use of four bearingsinall. With such an arrangement the length of the combined unit is veryconsiderable owing to the number of bearings employed and the spaceoccupied by the coupling member.

With the object of shortening the total length of a combined unit asabove referred to it has been proposed to emplby only two bearings forthe driving shaft of the dynamo and to attach the rotor of the magnetoto an extension of the dynamo shaft; in this arrangement however therotor was carried by a portion of the driving shaft external to orbeyond the bearings, but was otherwise unsupported. I

The present invention has for its object to enable two bearings only forthe common driving shaft of the combined magneto and dynamo to beemployed while at the same time enabling the rotating portion of themagneto tobe supported near both ends of its axis of rotation.

As a matter ofconvenience the common driving or through shaft of thecombined magneto and dynamo, instead of being constructed as a singleshaft, may be made in two portions with a. rigid coupling between themagneto and dynamo armature portions, and it is to be understood thatthe expression common driving shaft? as employed throughout thisspecification and claims is used as denoting a shaft compriseithersingle member or members sampled togathen A combined unit of the kindreferred to according to the present invention comprises an ignitionmagneto and a dynamo, or magneto and a combined dynamo and starter, inwhich there is provided a common driving shaft for the rotor of themagneto and the armature of the dynamo, said shaft being supported nearits extreme ends by two bearings only between which-bearings the rotorof the magneto is located. This construction, allows of the dynamo andmagnet being mounted together in the same casing. The shaft on which thedynamo and magneto are mounted may be arranged vertically orhorizontally as desired.

In order that the said invention may be clearly understood and readilycarried into effect, the same will now be described'more fully withreference to the accompanying diagrammatic drawings in which Figure 1represents an arrangement with a magneto and dynamo mounted together inthe same casing.

Figure 2 represents an arrangement similar to that shown in Figure 1 butwith the contact breaker and distributor gears arranged outside theadjacent bearing.

Figure 8 represents a further arrangement provided with means forcontrolling the timing of the magneto.

Figure 4 represents an arrangement with amagneto provided with a furthermeans for controlling the timing of the magneto and a dynamo mountedtogether in the same casing;

Referring to the arrangements illustrated in Figures 1 2 and 3 of thedraw ings, there is provided for the dynamo armature 1 and the rotor ofthe magneto, of which 2 is the rotatable magnet and 3 the stationaryarmature, a common driving shaft 14 which is supported in the twobearings 7; 8 represents the casing and field magnet system of thedynamo and 9 the cover for the magneto. The high tension distributor 4of the magneto is driven through reduction gearing 5, which may be ofany usual type such as spur, skew, worm, or bevel gearing. As shown inFigure l the gearing and the contact breaker or cam 6 are mounted on aportion of the common driving shaft between the two bear ing's 7, Whilstthe arrangement shown in 23 they mounted. on an 15 of the shaft outside,namely to the left of, the adjacent bearing 7.

In the modification shown in Figure 8, which is adapted to allow of handoperated control of the timing of the spark, the rotating magnet system,or inductors of the magneto the gear drive 5 to the high tension cistributor a and the contact breaker or cam G are mounted on the sleeve11, which sleeve is rotatably mounted on the driving shaft 1 1 and canbe given an angular movement dependent upon the speed of the saiddriving shaft, so that angular displacement may be obtained between thesleeve and the shaft. The disclosure of Fig. l shows the combination ofa dynan'io and an ignition magneto, as generally shown in Figs. 1 and 3,with a means for manually adjusting the timing of the spark. in additionto the dynamo 1 on the common driving shaft, the driving shaft 1% ismade up of a hollow portion l-l. adapted to receive a solid portion 19,which is movable longitudinally from th outside of the machine. Theportion 19 carries a pin 20 which slides along a slot 21 in the portionLi, and also engages with an elongated slot 22 in the rotatable hub 11which carries the distributor gears 5 and the contact breaker or cam 6.This arrangement allows the adjustment of the timing of the spark bymoving the part 19 into or out of the hollow portion of the shaft 14.

What I claim and desire to secure by Letters Patent of the United Statesis 1. A combined unit of the kind referred to comprising an ignitionmagneto provided with a fixed armature and a rotor and an electricdynamo provided with a rotary armature, a common driving shaft for therotor of the magneto and the armature of the dynamo, two bearings only,between which said rotor of the magneto is located, for supporting saidcommon driving shaft near its extreme ends, a sleeve on which the rotoris rotatably nounted 011 said common driving shaft, a high tensiondistributor driven from said sleeve, a contact breaker, said contactbreaker being actuated by said sleeve, and means for effecting relativeangular displacement between the sleeve and the shaft for controllingthe timing of the spark.

2. A combined unit of the kind referred to as in claim 1, in which saiddriving shaft is made hollow at one end and there is pro' vided a solidshaft carrying a pin, said solid shaft being longitudinally movablewithin the hollow part of the driving shaft, said hollow part of thedriving shaft being provided with an elongated slot cut at an angle tothe axis and said sleeve being pro vided with an elongated slot cut atan angle to the axis opposite to that of the slot formed in the drivingshaft, and said pin carried by the solid shaft engaging with the slotsin the driving shaft and sleeve so that axial movement of the solidshaft and the pin carried thereby imparts angular movement to thesleeve.

JAMES COCHRANE I-IUTTON.

